is 2 2011861 - 1
has 605631 decimal digits
takes 0.132 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26714.769468.6567%500000150000000.12305.1267%14.892470.2636%1.6069%
PrimeNet2580.019163.7931%90001500000.00162.6100%0.020764.7381%0.9450%
GPU722620.305466.1290%80001200000.00131.2722%0.306766.5599%0.4309%
Difference+5+14.4640+2.5277%+492000+14880000+0.1216+3.8545%+14.5856+3.7036%+3.7036%

Known prime factors (4 factors, 177.1 bits, 0.00880527% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
201186137018242411031.786920
23 × 5 × 23
-8231.705e-108.406e-71.552e-6
20118617956306696711239.533197735
5 × 71 × 557
2008-07-15715576.552e-89.293e-61.378e-5
2011861120775355519271443.4573001583
13 × 230891
2008-08-26132308919.862e-70.00120.0022
201186159745514964619805611962.3741484832077480
23 × 5 × 29 × 3259 × 392767
2016-01-2132593927670.58000.00230.0038

11 Composite Factors:
exponentprime factorscomposite factordigitsbits*
201186129452848998711712947112271.319
2011861447089138776626828624072375.243
201186196092576991549896045060172582.991
2011861221167395587057853755805792012994.159
2011861475353640811392078093941426543131101.907
20118617215785810533823018256868009104732105.831
20118613557178308874782573406337656095809735114.776
20118611759675630603218103643517448011368411287141133.692
201186126711570831297939199387059560841187167032742137.617
20118615741100496637525134011506353179028986153553744145.364
201186121252544988469929531330567791123636913784878434955
2417
54177.150
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-01-21T18:00:04alpertronManual testing50000015000000121962.3740.0480.2650.0955.127%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-08-26T20:20:00ANONYMOUSManual testing??43.457144.03804e-70.2888.78505e-7
2008-07-15T07:49:00J FeitsmaManual testing??39.533122.91144e-80.2886.33407e-8


ECM factoring results:

Old Calculation Method

Total ECM effort:3.732 GHz-days
Estimated T-Level:2.050
DigitsB1CurvesCompleteFacMiss
201100041 / 1000.41066.228%
255000041 / 2800.14686.356%

New Calculation Method

Total ECM effort:3.732 GHz-days
Estimated T-Level:2.050
DigitsB1CompleteFacMiss
20110001.64419.316%
25500000.15285.886%
302500000.01099.040%


ECM Summary

B1B2factorcurvesGHz-days
500005000000201.693
50000669886170.674
50000675000070.676
50000700000070.688


Lucas-Lehmer results:
No L-L results for M2011861


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:33:32alpertronManual testing
3701824241
795630669671
12077535551927
5974551496461980561
FF0D8E6F317845__no
2017-10-20T19:25:16Oliver KruseThreadripper
3701824241
795630669671
12077535551927
5974551496461980561
FF0D8E6F317845__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
TF factor-bounds graph:
267
2
230
240
250
260
270
280
290
2100
Last modified: 2022-06-22T18:17:02+00:00